1.

Two lenses (1) and (2) with R_(1) = R_(2) = 0.20 m each are made from glasses with mu_(1) = 1.2 and mu_(2) = 1.6 respectively. The two lenses with a separation of 0.345 m are submerged in a liquid with mu_(1) = 1.4. The focal lenghts of (1) and (2) are found. An object is placed at a distance of 1.3m from lens 1. The focal lenght of 2 is :

Answer»

`- 700 cm`
` + 700 cm`
7 cm
70 cm

Solution :(d) `(1)/(f_(2)) = (.^(L)mu_(g)-1) ((1)/(R_(1)) - (1)/(R_(2)))`
`mu_(g)= 1.2, mu_(l) = 1.4`
`R_(1) = 0.2 m, R_(2) = - 0.2 m`
`f_(2) = + 70 cm`


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